G3258 OC not working in Windows 10 Preview!

jumeeno · 4 Jun 2015 at 16:08

My backup machine has been running Windows 7 64-bit smoothly for the last 6 months, on a Pentium G3258 clocked @ 4.2GHz at 1.2v. The motherboard is an Asus H81-Plus.

Since installing the Windows 10 Preview a few weeks back, I've noticed that the overclock is no longer registered within the OS. In the BIOS all settings are the same, including the 4.2GHz overclock settings, but within Windows 10 I'm seeing a maximum of 3.2GHz (stock clocks) when looking at CPU-Z, HWMonitor, etc.

Any ideas?!? :confused:

jumeeno · 4 Jun 2015 at 18:33

wazza300 said:
its just a bug in the os detection,mines never seen my oc either on win7,its only worked in win8

So its working, just not 'displayed'? Maybe I should run a quick CPU benchmark to check

jumeeno · 4 Jun 2015 at 19:25

Well, whad'ya know! Just plugged it in, gone to Windows 10, started OpenHardwareMonitor... 4.2GHz showing!

What have I changed? Nothing!

Thanks Wazza

jumeeno · 4 Jun 2015 at 19:38

Okay... rebooted twice since, max clocks have been back to 3.2GHz?!?

Have tested with CPU-Z, Geekbench 3, etc.

Really odd. I mean, I'm changing nothing!

jumeeno · 4 Jun 2015 at 20:05

... sorted, kind of.

Cold boot, OC recognised.

However if you restart, comes back in at stock clocks. Odd.

jumeeno · 4 Jun 2015 at 21:37

No, not latest BIOS as was worried (a while back) that it might remove the H81 overclocking functionality. That said... might give it a go

jumeeno · 4 Jun 2015 at 22:22

No good! Latest BIOS now flashed, but still same scenario. Power up from off, 4.2GHz. Restart from Windows 10, 3.2GHz.

Tried toggling BIOS fast boot options and all sorts, but to no avail. Ah well... no restarts it is!

jumeeno · 8 Jun 2015 at 21:19

Phemo said:
Interesting that you're getting this too - I posted this thread the other day:

http://forums.overclockers.co.uk/showthread.php?t=18674948

Not sure what variant of board yours is (mine's the ITX one) but I'm getting exactly the same thing, it's really quite messed up. Spent ages trying various different BIOS'es etc but it shocks me that there's been 19 BIOS revisions and this problem persists. Not sure if it's a chipset related thing as technically overclocking on the H81 chipset is more of a bodge than being official. Either way, it's extremely annoying.

I was seeing it in Windows 8.1 so it's not a Windows 10 thing either. Definitely had CPU-Z only reporting 3.2GHz even with CPU under full load so despite BIOS settings being correct it would not be overclocked until I power the thing off then back on again.

Yup, exactly the same board and issue! I think it must be the board. Back to Windows 7 now... and all is well.